Another of my "Process experiments". This one was made by recording the sound of a jacket zipper being zipped up. I recorded it into Audacity and cut out a tiny slice of audio consisting of only 4 or 5 zipper notches being zipped. I ran that sound through a time stretch, gated it, added reverb, delay, and a few EQs and finally looped it so that it would play once normally, and once in reverse (ping pong loop). The result is this ominous reverberated sound.